I replaced my pads and rotors all around in August. I started to notice that my left front tire feels like it has a warped rotor when I come to a stop lately. Could the pad just be a little loose or just crappy rotors?

Could be a bad rotor. Or even a sticky slide. If the slide isnt letting the caliper release all the way, then it will overheat and warp the rotor. Check to make sure all the wheels spin freely with no excessive drag. If there is, you may need to take the caliper off and clean the slides and saddle really good and puts lots of lube on it to keep things sliding freely